What does it mean for a xlsm file to contain more than one type of separator?Why don't you provide the row or column number where a problem was met?Currently I have not yet found whats wrong with my file.

After many trials I now understand what happened:Every 2 or 3 predictors entered I loaded them to check that they were correct. but if the last one, considered as the Response, had missing values, I got an error. With the true Response (free of missing values) always positionned as the last parameter, I could load safely, with occasionally missing values in predictors.